Derrick construction



May 3, 1932. C'HAPMAN 1,856,907

DERRICK CONSTRU'G-TION v Filed July 24 1931,.

INVENTOR- Patented May 3, 1932 PATENT OFFICE PAUL CHAPMAN, OF NEW YORK, N. Y.

DERRICK CONSTRUCTION Application filed July 24,

This invention in derrick construction provides a portable derrick of the rigid leg type having means of reducing loss of power due to friction and the elastic deformation of the members of the derrick under stress, and having great adjustability.

Referring to the accompanying drawings Fig. 1 is a perspective View of the construction. Fig. 2 is an elevational view showing in detailthe top connections at the masthead. Fig. 3 is a sectional View at the center of the masthead perpendicular to that of Fig. 2. Fig. 4 is a part sectional part elevational view at the foot of the mast. 'Fig. 5 is, an elevational view showing an alternate connec tion at the masthead replacing the split rotating mast of Fig. 1 with an enclosing rotating mast. Fig. 6 is an elevational view showing the connection of the enclosing rotating mast to the swivel at its base. Fig. 7 is an elevational view at the masthead of an alternate construction providing greater lateral movement of the boom. Fig. 8 is a sectional View perpendicular to that of Fig. 7. Fig. 9 is an elevational View showing an alternate construction for holding the top of the split rotating mast in position.

Referring to Fig. l, the load 1 lifted by the fall line 2 attached to the engine drum 2a, produces compression in the boom 3 and tension in the top lift line 1 attached to the en gine drum 4a. The fall line 2 and the toplift line A pass over sheaves 2b and 1?) respectively then down the center of the fixed mast 5 then over the sheaves 20 and 40 respectively (shown in Fig. 4) to their engine drums. At the top of the mast, the toplift 4i and the fall line 2 produce a vertical reaction'which is resisted by the rotating mast 6, and also a horizontal reaction which is resisted by the rigid legs 7. The rigid legs being inclined produce a vertical reaction in the fixed mast 5. At their lower ends the rigid legs 7 produce vertical reactions in the anchors 8 and horizontal reactions in the horizontal sills 9. The compression in the boom at its spread ends 34 and the stress in the rotating mast at its spread ends 601;, are resisted by the horizontal swivel member 10 which rotates with the boom V 3 and the rotating mastt,- when a force is 1931. Serial No. 552,856.

applied tothe swing wheel 11 by means of the lines 11a attached to the engine drums 116. At the center of the swivel 10, the horizontal reaction is resisted by the sills 9 and the vertical reaction by the end of the engine sill 5a. The ends of the sills 9 are also sup ported on the end of the sill 5a as shown in Fig. 4. p Referring to Fig. 2, the end of the rotating mast 66 supports the pins of the sheaves 2b and ib and the horizontal link which is connected to the bearing member 6d by a pin. The link 60 with the pins prevent any binding and resultant friction between the 6d and the bearing member 56 (Fig. 3), due to 6 the difference in elastic deformation of the fixed mast 5 and the rotating mast 6 under stress. 7

Referring to Figs. 2 and 3, the end of the rotating mast Gb fits loosely in a notch in a lock member 6e which is attached to the bearing member 6d only, thereby holding the lines 2 and i at the'center of the fixed mast 5 and resisting any lateral thrust from the rotating mast 6 as stress is applied to the swing wheel 11.- The bearing member 5?) around which the member 6d rotates, has screw threads 50 at its upper end which enable the members 7a attached to the rigid legs 7 to be forced firmly against a projection 5d on the fixed mast 5. lVhen the boom projection in a horizontal plane forms an angle greater than 180 degrees with either sill, a compression stress results in the rigid leg nearer to the boom," causing severe stress due to distortion in the member 7a unless it be clamped firmly. The lock member 75 prevents possible extreme upward travel of the'mem'ber 6d. j

Referring to Figs. 1 and l, the fixed mast 5 is connected at its lower end to a hollow cylindrical member 5e which carries theload from the mast and also the swivel 10 to the member 5/ which is connected to the engine sill 5a. The swivel 10 rotates about the member 56, the horizontal and vertical reactions from the swivel being'transferred from a hollow spherical portion 10a to a spherical projection 5h of the member 56. Excessive'ti'lting of the swivel due to elastic deformation when stress is applied to the swing wheel is limited by a projecting ring 106 at the top of the swivel 10. The hollow cylindrical space between 10a and 106 provides a well for lubricant. The horizontal reaction transferred to the member 5c is resisted by the sills 9 being carried thru the members 9?) and 90 which have holes for the member to pass thru. The reaction from the swing wheel lines 11a as they pass over the sheaves 11c and the sheaves themselves is resisted by a member 11d rigidly attached to the engine sill 5a, the engine sill the member 5 and the member 11d forming a unit.

Referring to Figs. 1, 7, and 8, the upper portion of the rotating mast 6 interferes with the rigid leg 7 when the boom is rotated until its plane nears the plane of the rigid leg 7, and the portable derrick alternate for the top of the mast is used, as shown in Fig. 7 and Fig. 8; The rotating mast 6 is cut oif below the cheek pieces 5k and held in position for rotation about the fixed mast 5 by a hollow cylindrical attached member 6h thru which the mast 5 passes. A hollow cylindrical bearing member 5m having vertically projecting cheeks 5a which support the pins of the sheaves 2b 4b and the link 4d, rotates with the boom. A cap bearing 5;? attached to the mast 5 by screw threads 57 and clamping the pieces 7a between itself and the ledge 5d, resists the horizontal and upward vertical stresses transmitted to it thru the cylindrical bearing projections 53 and 5t on the rotating bearing member 5m. The downward vertical stress from the rotating bearing member 5m is resisted by the top of the mast 5 bearing against the projection 58. The bearings 58 and 56 on the member 5m are placed relatively far apart to prevent binding and provide a hollow cylindrical space for lubricant. By this alternate construction the boom can be rotated until it is substantially in the plane of the rigid leg.

Referring to Figs. 1, 5 and 6, in the portable derrick at times an alternate to the spread leg rotating mast is used consisting of an enclosing rotating mast 6 loosely fitting around the fixed mast 5, and having a curved upper portion 670 attached for supporting the pins of the sheaves 2b, 4b and the link 60 and resisting the vertical reaction of the line 2 and the top lift 4. The bottom of the rotating mast 6 is attached to the swivel 10, thereby holding the swivel 10 horizontal when aforce is applied to the swingwheel 11.

Referring to Fig.9, the top of the rotating mast 6 is held in radial position by a member 6f rigidly attached to the rotating mast and having a cylindrical hole at its endthrough which the fixed mast 5 extends.

By means of the construction hereinbefore described, the mast 5 remains fixed as the boom rotates and there is no loss of power due to turning the reaction from the rigid legs 7, and no vertical reaction is rotated othsaid rotating mast to the said fixed mast at its base; a top-lift; a top-lift line; a fall line; a hollow center in said fixed mast, thru which the said top-lift line and the said fall line pass; sheaves supported by the upper end of the said rotating mast, over which the said toplift line and the said fall line pass downward; a horizontal pin-connected link connecting the said top-lift and rotating mast with a rotating bearing on the top of the said fixed mast; a rotating bearing on the top of the said fixed mast; means to transfer horizontal stress only to the said fixed mast and two rigid-legs extending from the top of the fixed mast, substantially as described.

2. In derrick construction: a spread base rotating boom; a spread base rotating mast; a fixed mast; a horizontal swivel transferring the loads from the said boom and the said rotating mast to the said fixed mast at its base; a top-lift; a top-lift line; a fall line; a hollow center in the said fixed mast; sheaves supported by the upper end of the said rotating mast, over which the said toplift line and the said fall line pass downward thru the said hollow center of the said fixed mast; a rotating bearing on the top of the said fixed mast; a horizontal pin-connected link connecting the said top-lift and rotating mast with the said rotating bearing on the top of the said fixed mast; a projecting top end on the said rotating mast; alock member fixedly attached to the said rotating member, having a notch into which the said projecting top end of the said rotating mast loosely fits; a swing-wheel rigidly attached to the said horizontal swivel; means to hold the said top-lift line and the said fall line at the center of the said fixed mast as said lines pass downward, and means to transfer a portion of the turning force. applied to the said swing-Wheel, to the rotating bearing on the top of said fixed mast with out tilting the said swing-wheel, substantial- 1y as described. 7 r

3. In derrick construction: a spread base rotating boom; a hollow cylindrical rotating mast; a fixed mast around which said rotating mast rotates; a'horizontal swivel fixedly attached to the said rotating-mast, transferring the loads from the said boom and the said rotating mast to the said fixed mast at its base; a top-lift; a top-lift line; a fall line; a hollow center in the said fixed mast; a curved member attached to the top of the fixed mast; two sheaves supported by the said curved member, over which the said top-lift and fall lines pass downward thru the said hollow center of the said fixed mast; a rotating bearing on the top of the said fixed mast; a horizontal pin-connected link connecting the said top-lift and rotating mast with the said rotating bearing on the top of the said fixed mast; two rigid-legs extending downward from the top of said fixed mast; means to transfer horizontal stress only to the said fixed mast and the said two rigidlegs, substantially as described.

4. In derrick construction: a spread base rotating boom; a spread base rotating mast; a fixed mast; a horizontal swivel transferring the loads from the said boom and the said rotating mast to the fixed mast at its base; a top-lift; a top-lift line; a fall line; a hollow center in the said fixed mast; sheaves supported by the upper end of the said rotating mast, over which the said top-lift and the said fall lines pass downward thru the said hollow center of the said fixed mast; a rotating bearing at the top of the said fixed mast; a horizontal pin-connected link connecting the said top-lift and rotating mast with the said rotating bearing on the top of the said fixed mast; a fixedly attached member on the said rotating mast near its top, having a hollow cylindrical end portion encasing the said fixed mast near its top, in order to hold the top of the said rotating mast at a fixed radial distance from the fixed mast; means to hold the said top-lift and said fall lines at the center of the fixed mast, as they pass downward, substantially as described.

5. In derrick construction: a spread base rotating boom; a spread base rotating mast; a fixed mast; a cylindrical ring fixedlyattached to the two arms of the said rotating mast, and forming its top, and also loosely encasing the said fixed mast; a top-lift; a top-lift line; a fall line; a hollow center in the said fixed mast; a hollow cylindrical bearing member rotating inside of the said fixed mast at its top; a pin-connected link connecting the said top lift with the said hollow cylindrical bearing member; sheaves supported by the said hollow cylindrical bearing member, over which said top-lift and said fall lines pass downward thru the hollow cylindrical bearing member; rigid-legs projecting downward from the top of the said fixed mast; a cap bearing member adjustably attached to the fixed mast by screw threads at its top; a projecting cylindrical ring on the said fixed mast directly below parts of the said rigid-legs encasing the said fixed mast; said cap bearing member clamping by means of the said screw threads, the two said parts of the said rigid-legs between itself and the said projecting ring on the said fixed mast; a projecting cylindrical bearing ring on the said rotating bearing member, in contact at its side and top with the said cap bearing member, and in contact with the top of the said fixed mast at its bottom, in order to restrain the said rotating member horizontally and vertically; a projecting cylindrical ring at the bottom of the said rotating bearing member in contact with the inner surface of the fixed mast, to restrain the said rotating bearing member horizontally; a horizontal swivel transferring the loads from the said boom and the said rotating mast to the said fixed mast at its base; a swing-wheel; means to permit the rotation of the said boom laterally until it touches the said rigid-legs, substantially as described.

6. In derrick construction: a spread base rotating boom; a rotating mast; a fixed mast; a horizontal swivel transferring the load from the said boom and the said rotating mast to the said fixed mast at its base; a toplift; a top-lift line; a fall line; a hollow center in the fixed mast thru which the said top-lift line and the fall line pass down ward; a rotating bearing on the top of the said fixed mast; a pin-connected linkconnecting the top-lift with the said rotating bearing; a cylindrical bearing member on the top of the fixed mast co-axial with the said rotating bearing; two horizontal base sills with opposite ends encasing the base of the fixed mast and attached to the ends of two rigid-legs; two said rigid-legs extending from the top of the said fixed mast to the ends of the said horizontal base sills; members onthe said rigid-legs at their tops having cylindrical holes encasing the top of the said fixed mast a cylindrical projecting ring on the said fixed mast near its top screw threads on the said cylindrical bearing member in mesh with screw threads on the top of the said fixed mast, for clamping the said members on the rigid-legs between the said projecting ring on the fixed mast and the said cylindrical bearing member; means to adjust the said rigid-legs together with the said horizontalbase sills, horizontally, and to clamp the said rigid-legs to the said fixed mast in adjusted position, substantially as described.

Signed at 1482 Broadway, New York city, in the county of New York andthe State of New York, this thirtieth day of June, 1931. PAUL CHAPMAN. 

